PDF malware analysis — malicious · 40417e72a191204a

MALICIOUS

PDF

77.1 KB Created: 2021-09-11 16:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 568988afba4b7b4b6f2071c7cdcb080c SHA-1: 35b72dfa7647a5739d8dab99e328a753c736569c SHA-256: 40417e72a191204a851897c08e7d935c0102ec4cc347b5d15f6abcaf61fc4ec7

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://krisoc.ru/uplcv?utm_term=howard+anton+linear+algebra+solutions PDF link annotation
- https://alshuka.ps/ckfinder/userfiles/files/jifawovoluwibida.pdfIn PDF document text
- https://intersensor.ro/v2011/Files/fck_upload/file/rejidufokafipa.pdfIn PDF document text
- http://yuh-tarng.com/userfiles/file/gemugutaxeranazaz.pdfIn PDF document text
- http://studiocariola.com/userfiles/files/tekenagosorulufikubifaf.pdfIn PDF document text
- https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613405c18f5e3---lodixikafotoxoxajupirur.pdfIn PDF document text
- https://akamercedes.com/images/uploads/files/37515059939.pdfIn PDF document text
- https://durimawar.com/contents/files/dedos.pdfIn PDF document text
- https://rimsball.com/ckfinder/userfiles/files/95228450587.pdfIn PDF document text
- http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130738115176---bagokufew.pdfIn PDF document text
- https://profm.hu/files/file/ronamigodizawala.pdfIn PDF document text
- http://brenno-tojestto.pl/userfiles/file/16054163031.pdfIn PDF document text
- https://fuoriscena.eu/file/bifexuzig.pdfIn PDF document text
- http://mstreatmentadvances.com/userfiles/files/1561818345.pdfIn PDF document text
- https://thucphamtruongxanh.com/Upload/files/28240606524.pdfIn PDF document text
- https://ecableapp.com/FCKeditor/FCKimgUpload/file/72039995536.pdfIn PDF document text
- http://cisseo.net/userfiles/files/gativerusezal.pdfIn PDF document text
- https://gestionarival.com/userfiles/file/65172246458.pdfIn PDF document text
- https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/movujamesifejedokitugo.pdfIn PDF document text
- http://bbmeti.it/userfiles/files/vobomunomu.pdfIn PDF document text
- https://mmagame.com/userfiles/file/wuvisoseb.pdfIn PDF document text
- https://laatuwhuisweerstralen.nl/upload/file/koxibuluju.pdfIn PDF document text
- http://friend5190.xyz/js/ckfinder/userfiles/files/30323409419.pdfIn PDF document text
- http://aprt1day.ru/file/wigesapem.pdfIn PDF document text
- https://fsbulletsandbrass.com/userfiles/files/13420093379.pdfIn PDF document text
- https://hfbee.tw/upload/ckfinder_temp/files/20210905073430.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c872.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC872	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e084.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE084	17472 bytes
SHA-256: `614bc209fa70a418ed5533faae9ffda85bb78f9f2c279ed58975f0e4613a2ba0`
`font_02_sfnt_off00010dac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DAC	10740 bytes
SHA-256: `c487ebe7c6ffbfe668ddd6bf0cfd1d277fffe9660722c0004b9984c2f9378635`

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